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- W1977800347 abstract "Abstract Tuff layers from stratigraphically significant sites of the Middle Rhine and Wetterau areas, Federal Republic of Germany, were dated by sanidines, using the 40Ar/39Ar age determination technique. The main dating problem was to get ultrapure mineral separates free of any contaminating detrital K-feld-spars. The shapes of the age spectra were used to distinguish contaminated from pure separates. From the reliable age data we infer that the tuffs were deposited in a narrow interval during the Middle Pleistocene (500 ± 10 to 420 ± 20 ka). We conclude that the formation of the Rhine River Terrace tR8, the so-called middle Middle Terrace, happened 450 ka ago. Bracketing warm period sediments are dated by sanidines as follows: younger warm period, 420 ka ago and older warm period, 500 ka ago. These warm periods possibly correspond with Holsteinian and Cromerian IV. Thus the intervening cold period (the time of formation of tR8) is determined to be Elsterian in age with an approximate duration of ∼ 60 ka. With regard to the Deep Sea record, the three climatic periods can be correlated with the δ18O stages 11, 12 and 13, respectively." @default.
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- W1977800347 date "1986-01-01" @default.
- W1977800347 modified "2023-09-26" @default.
- W1977800347 title "40Ar/39Ar age determinations on sanidines of the Eifel volcanic field (Federal Republic of Germany): Constraints on age and duration of a Middle Pleistocene cold period" @default.
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- W1977800347 doi "https://doi.org/10.1016/0168-9622(86)90071-0" @default.
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